Cosmos/source/Cosmos.IL2CPU/ILOpCodes/OpVar.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;

namespace Cosmos.IL2CPU.ILOpCodes
{
  public class OpVar : ILOpCode
  {
    public readonly UInt16 Value;

    public OpVar(Code aOpCode, int aPos, int aNextPos, UInt16 aValue, ExceptionHandlingClause aCurrentExceptionHandler)
      : base(aOpCode, aPos, aNextPos, aCurrentExceptionHandler)
    {
      Value = aValue;
    }

    public override int GetNumberOfStackPops(MethodBase aMethod)
    {
      switch (OpCode)
      {
        case Code.Ldloc:
        case Code.Ldloca:
        case Code.Ldarg:
        case Code.Ldarga:
          return 0;
        case Code.Stloc:
        case Code.Starg:
          return 1;
        default:
          throw new NotImplementedException("OpCode '" + OpCode + "' not implemented!");
      }
    }

    public override int GetNumberOfStackPushes(MethodBase aMethod)
    {
      switch (OpCode)
      {
        case Code.Stloc:
        case Code.Starg:
          return 0;
        case Code.Ldloc:
        case Code.Ldloca:
        case Code.Ldarg:
        case Code.Ldarga:
          return 1;
        default:
          throw new NotImplementedException("OpCode '" + OpCode + "' not implemented!");
      }
    }

    protected override void DoInitStackAnalysis(MethodBase aMethod)
    {
      base.DoInitStackAnalysis(aMethod);

      switch (OpCode)
      {
        case Code.Ldloc:
          var xBody = aMethod.GetMethodBody();
          if (xBody != null)
          {
            StackPushTypes[0] = xBody.LocalVariables[Value].LocalType;
            if (StackPushTypes[0].IsEnum)
            {
              StackPushTypes[0] = StackPushTypes[0].GetEnumUnderlyingType();
            }
          }
          return;
        case Code.Ldloca:
          StackPushTypes[0] = typeof(void*);
          return;
        case Code.Ldarga:
          StackPushTypes[0] = typeof (void*);
          return;
        case Code.Ldarg:
          var xArgIndexCorrection = 0;
          if (!aMethod.IsStatic)
          {
            if (Value == 0)
            {
              StackPushTypes[0] = aMethod.DeclaringType;
              if (StackPushTypes[0].IsEnum)
              {
                StackPushTypes[0] = StackPushTypes[0].GetEnumUnderlyingType();
              }
              else
              {
                if (StackPushTypes[0].IsValueType)
                {
                  StackPushTypes[0] = typeof (void*);
                }
              }
              return;
            }
            xArgIndexCorrection = -1;
          }
          var xParams = aMethod.GetParameters();
          StackPushTypes[0] = xParams[Value + xArgIndexCorrection].ParameterType;
          if (StackPushTypes[0].IsEnum)
          {
            StackPushTypes[0] = StackPushTypes[0].GetEnumUnderlyingType();
          }
          return;
        default:
          break;
      }
    }
  }
}